| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely execute call processing by switching a transmission system. <P>SOLUTION: A mobile phone (10) includes a processor 24 which controls switching of a selector 54. In call processing, a transmission audio signal (first transmission signal) input through a microphone (18) is converted to a digital audio signal. The processor commands a CDMA signal processing circuit 60 to perform encoding processing and modulation processing on the digital audio signal. The processed digital audio signal is output through a coupler 56a, the selector, a PA 52a, a duplexer 50a, and an antenna 12a. An output signal from the coupler 56a is converted to a voltage value at a detector circuit 64, and input to the processor. The processor detects a power value of a reflection wave of the PA 52a on the basis of the voltage value, determines a transmission system including the PA 52a to be out of order and transmits a switching signal to the selector to connect an output end T1 of the coupler to an input end of a PA 52b, when the power value exceeds a predetermined threshold. <P>COPYRIGHT: (C)2013,JPO&INPIT |
